期刊
INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW
卷 67, 期 -, 页码 69-78出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.ijheatfluidflow.2017.07.009
关键词
Wall-bounded turbulence; Turbulent duct flow; Corner geometry; Secondary motions; Direct numerical simulation
资金
- Swedish Research Council (VR)
- Knut and Alice Wallenberg Foundation
- Office of Science of the US Department of Energy
Direct numerical simulations of fully-developed turbulent flow through a straight square duct with increasing corner rounding radius r were performed to study the influence of corner geometry on the secondary flow. Unexpectedly, the increased rounding of the corners from r = 0 to 0.75 does not lead to a monotonic trend towards the pipe case of r = 1. Instead, the secondary vortices relocate close to the region of wall-curvature change. This behavior is connected to the inhomogeneous interaction between near-wall bursting events, which are further characterized in this work with the definition of their local preferential direction. We compare our results with those obtained for the flow through a square duct (which corresponds to r = 0) and through a round pipe (r = 1), focusing on the influence of r on the wall-shear stress distribution and the turbulence statistics along the centerplane and the corner bisector. The former shows that high-speed streaks are preferentially located near the transition between straight and curved surfaces. The Reynolds numbers based on the centerplane friction velocity and duct half-height are Re tau, c similar or equal to 180 and 350 for the cases under study. (C) 2017 Elsevier Inc. All rights reserved.
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